FWT and OBT concentrations in pine needle samples collected at Toki, Japan (1998-2012)
| Autor: | K. Nishimura, Masahiro Tanaka, T. Kawano, Hitoshi Miyake, T. Tamari, Tatsuhiko Uda, Naofumi Akata, Hideki Kakiuchi |
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| Rok vydání: | 2015 |
| Předmět: |
Radiation
Radiological and Ultrasound Technology Organic chemicals Public Health Environmental and Occupational Health Reproducibility of Results Water General Medicine Pinus Radiation Dosage Tritium Sensitivity and Specificity Background level Plant Leaves Pinus Animal science Japan Radiation Monitoring Free water Background Radiation Environmental science Biological Assay Radiology Nuclear Medicine and imaging Organic Chemicals Organically bound tritium |
| Zdroj: | Radiation Protection Dosimetry. 167:210-214 |
| ISSN: | 1742-3406 0144-8420 |
| DOI: | 10.1093/rpd/ncv246 |
| Popis: | Free water tritium (FWT) and organically bound tritium (OBT) concentrations in pine needles have been investigated to understand the regional background tritium concentration in Toki City. Samples were regularly collected from pine trees on the National Institute for Fusion Science campus (1998-2012) and the nearby Shiomi Park (SP; 2002-12). FWT and OBT concentrations of the former samples ranged from 0.33 to 0.92 and 0.41 to 1.10 Bq l(-1), respectively, while those of the latter samples ranged from 0.32 to 0.86 and 0.33 to 0.79 Bq l(-1), respectively. Results of both sampling sites were almost the same, and they have been gradually decreased year by year. Concentration level of tritium for Toki City was close to the average background level in Japan. The OBT/FWT ratios were almost 1.0. The apparent half-life of FWT in this period was estimated as almost 10 y, and that of OBT was estimated as almost 12 y; these values were almost the same as the physical half-life. |
| Databáze: | OpenAIRE |
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